Merge pull request #15044 from edx/bjacobel/mako-bundle-nonfatal

Mako should be able to render even if webpack hasn't run

common/djangoapps/pipeline_mako/templates/static_content.html

 <%page expression_filter="h"/>
 <%!
+import logging
 from django.contrib.staticfiles.storage import staticfiles_storage
 from pipeline_mako import compressed_css, compressed_js
 from django.utils.translation import get_language_bidi
@@ -18,6 +19,7 @@ from openedx.core.djangoapps.theming.helpers import (
 )
 from certificates.api import get_asset_url_by_slug
 from openedx.core.djangoapps.lang_pref.api import released_languages
+logger = logging.getLogger(__name__)
 %>
 
 <%def name="marketing_link(name)"><%
@@ -92,16 +94,20 @@ source, template_path = Loader(engine).load_template_source(path)
     </%doc>
     <%
         from django.template import Template, Context
-        return Template("""
-            {% load render_bundle from webpack_loader %}
-            {% render_bundle entry %}
-            <script type="text/javascript">
-                {% autoescape off %}{{ body }}{% endautoescape %}
-            </script>
-        """).render(Context({
-            'entry': entry,
-            'body': capture(caller.body)
-        }))
+        try:
+            return Template("""
+                {% load render_bundle from webpack_loader %}
+                {% render_bundle entry %}
+                <script type="text/javascript">
+                    {% autoescape off %}{{ body }}{% endautoescape %}
+                </script>
+            """).render(Context({
+                'entry': entry,
+                'body': capture(caller.body)
+            }))
+        except IOError as e:
+            # Don't break Mako template rendering if the bundle or webpack-stats can't be found, but log it
+            logger.error(e)
     %>
 </%def>